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https://issues.apache.org/jira/browse/LUCENE-8229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward resolved LUCENE-8229.
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       Resolution: Fixed
    Fix Version/s: 7.4

Thanks everyone.  I'm really excited about this feature!

> Add a method to Weight to retrieve matches for a single document
> ----------------------------------------------------------------
>
>                 Key: LUCENE-8229
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8229
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Alan Woodward
>            Assignee: Alan Woodward
>            Priority: Major
>             Fix For: 7.4
>
>         Attachments: LUCENE-8229.patch
>
>          Time Spent: 5h 20m
>  Remaining Estimate: 0h
>
> The ability to find out exactly what a query has matched on is a fairly 
> frequent feature request, and would also make highlighters much easier to 
> implement.  There have been a few attempts at doing this, including adding 
> positions to Scorers, or re-writing queries as Spans, but these all either 
> compromise general performance or involve up-front knowledge of all queries.
> Instead, I propose adding a method to Weight that exposes an iterator over 
> matches in a particular document and field.  It should be used in a similar 
> manner to explain() - ie, just for TopDocs, not as part of the scoring loop, 
> which relieves some of the pressure on performance.



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